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In 2007, three mature hemi-boreal stands were selected from Järvselja forest district, South-East Estonia to establish one-hectare-large test plots for the international inter-comparison experiment of radiation models (RAMI). All trees with a stem diameter at breast height greater than 4 cm were mapped and measured in the field. In summer 2019, the forests were inventoried again. Here we present a summary of changes that occurred in the forest structure – mainly growth and mortality. In the birch stand basal area  G  has increased from 23.3 m 2  ha -1  to 28.2 m 2  ha -1  in the upper layer and the number of trees  N  has decreased from 654 to 565 ha -1 . In the upper layer of spruce stand  G  has increased from 30.9 m 2  ha -1  to 35.4 m 2  ha -1  and  N  has decreased from 774 to 724 ha -1  and  N  substantially decreased in the lower layers from 912 to 577 ha -1 . In the pine stand  G  has increased from 28.3 m 2  ha -1  to 29.1 m 2  ha -1  and N decreased from 1116 to 971 ha -1 . The three test stands can be used now for validating remote sensing data-based estimates of forest inventory variables at single tree level.

Changes during twelve years in three mature hemiboreal stands growing in a radiation model intercomparison test site, Järvselja, Estonia